No, I don't smoke weed, mostly because I am too young to do so yet. It's legal to use it where I live, and I have considered trying it at least once just to experience it, figure out how it feels. I can only say I've been high once in my life, and that was in a hospital, when they had me drugged so they could painlessly remove a couple of drains from my body after I had heart surgery three years ago. It's weird, really. The entire room started spinning, and even in my high, I was able to think and reason with what I was experiencing, it wasn't at all like I had a decrease in my sagacity, but seeing all kinds of weird hallucinations obviously prompts you to start laughing at how weird the world is.
I don't try to judge other people who want to use weed for recreational purposes. To be frank, I think tobacco is more damaging to a person's health than weed, but I am very concerned with people when they start at too young an age. If they're still developing their bodies and their minds, then taking any drug is going to seriously arrest their brain development. I hate seeing 15, 14, or heck, even 13 year olds smoking a cig while cycling to school and being proud about it too, 'cause they're so cool breaking the law and killing their lungs at that young an age. It's hard not to judge those kinds of people.
I do not think recreational drug use should be criminalised for that matter. It's just giving criminal organisations the opportunity to profit from a whole market being underground, addicts can't go anywhere for help because that'd mean admitting to committing a (victimless) crime, and too often, the drugs that are sold in the illegal circuit are multiple times more dangerous than legal substances. I have indeed heard of some very scary stories of people finding that they had blunts that were laced with meth in countries where it is illegal.
Bottom line, if it's done in a controlled environment, then who cares?